3GPP TS V8.1.0 ( )

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1 TS V8.1.0 ( ) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Access Network (E-UTRAN); S1 Application Protocol (S1AP) (Release 8) The present document has been developed within the 3 rd Generation Partnership Project ( TM ) and may be further elaborated for the purposes of. The present document has not been subject to any approval process by the Organizational Partners and shall not be implemented. This Specification is provided for future development work within only. The Organizational Partners accept no liability for any use of this Specification. Specifications and reports for implementation of the TM system should be obtained via the Organizational Partners' Publications Offices.

2 2 TS V8.1.0 ( ) Keywords UMTS, radio Postal address support office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Tel.: Fax: Internet Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. 2008, Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC). All rights reserved.

3 3 TS V8.1.0 ( ) Contents Foreword 8 1 Scope..9 2 References 9 3 Definitions, symbols and abbreviations Definitions Symbols Abbreviations 11 4 General Procedure Specification Principles Forwards and Backwards Compatibility Specification Notations 11 5 S1AP Services.13 6 Services Expected from Signalling Transport.14 7 Functions of S1AP 15 8 S1AP Procedures List of S1AP Elementary procedures SAE Bearer Management procedures SAE Bearer Setup General Successful Operation Unsuccessful Operation Abnormal Conditions SAE Bearer Modify General Successful Operation Unsuccessful Operation Abnormal Conditions SAE Bearer Release General Successful Operation SAE Bearer Release - MME initiated SAE Bearer Release Request - enb initiated Abnormal Conditions Context Management procedures Initial Context Setup General Successful Operation Unsuccessful Operation Abnormal Conditions UE Context Release Request - enb initiated General Successful Operation UE Context Release (MME initiated) General Successful Operation UE Context Modification General Successful Operation Unsuccessful Operation Handover Signalling Handover Preparation General Successful Operation. 26

4 4 TS V8.1.0 ( ) Unsuccessful Operation Abnormal Conditions Handover Resource Allocation General Successful Operation Unsuccessful Operation Abnormal Conditions Handover Notification General Successful Operation Abnormal Conditions Path Switch Request General Successful Operation Unsuccessful Operation Abnormal Conditions Handover Cancellation General Successful Operation Unsuccessful Operation Abnormal Conditions enb Status Transfer General Successful Operation Unsuccessful Operation Abnormal Conditions MME Status Transfer General Successful Operation Unsuccessful Operation Abnormal Conditions Paging General Successful Operation Unsuccessful Operation Abnormal Conditions NAS transport General Successful Operations Initial UE Message DOWNLINK NAS TRANSPORT UPLINK NAS TRANSPORT NAS NON DELIVERY INDICATION Unsuccessful Operation Abnormal Conditions Management procedures Reset General Successful Operation Reset Procedure Initiated from the MME Reset Procedure Initiated from the E-UTRAN Abnormal Conditions Abnormal Condition at the CN Abnormal Condition at the E-UTRAN Crossing of Reset Messages Error Indication General Successful Operation Abnormal Conditions S1 Setup General Successful Operation. 38

5 5 TS V8.1.0 ( ) Unsuccessful Operation Abnormal Conditions S1 CDMA2000 Tunneling Procedures General Successful Operations Downlink S1 CDMA2000 Tunneling Uplink S1 CDMA2000 Tunneling Unsuccessful Operation Abnormal Conditions UE Capability Info Indication General Successful Operation Elements for S1AP Communication Message Functional Definition and Content General Message Contents Presence Criticality Range Assigned Criticality SAE Bearer Management Messages SAE BEARER SETUP REQUEST SAE BEARER SETUP RESPONSE SAE BEARER MODIFY REQUEST SAE BEARER MODIFY RESPONSE SAE BEARER RELEASE COMMAND SAE BEARER RELEASE COMPLETE SAE BEARER RELEASE REQUEST Context Management Messages INITIAL CONTEXT SETUP REQUEST INITIAL CONTEXT SETUP RESPONSE INITIAL CONTEXT SETUP FAILURE UE CONTEXT RELEASE REQUEST UE CONTEXT RELEASE COMMAND UE CONTEXT RELEASE COMPLETE UE CONTEXT MODIFICATION REQUEST UE CONTEXT MODIFICATION RESPONSE UE CONTEXT MODIFICATION FAILURE Handover Signalling Messages HANDOVER REQUIRED HANDOVER COMMAND HANDOVER PREPARATION FAILURE HANDOVER REQUEST HANDOVER REQUEST ACKNOWLEDGE HANDOVER FAILURE HANDOVER NOTIFY PATH SWITCH REQUEST PATH SWITCH REQUEST ACKNOWLEDGE PATH SWITCH REQUEST FAILURE HANDOVER CANCEL HANDOVER CANCEL ACKNOWLEDGE enb STATUS TRANSFER MME STATUS TRANSFER PAGING NAS Transport Messages INITIAL UE MESSAGE DOWNLINK NAS TRANSPORT UPLINK NAS TRANSPORT NAS NON DELIVERY INDICATION Management messages RESET.. 62

6 6 TS V8.1.0 ( ) RESET ACKNOWLEDGE ERROR INDICATION S1 SETUP REQUEST S1 SETUP RESPONSE S1 SETUP FAILURE S1 CDMA2000 Tunneling Messages DOWNLINK S1 CDMA2000 TUNNELING UPLINK S1 CDMA2000 TUNNELING UE CAPABILITY INFO INDICATION Information Element Definitions General Radio Network Layer Related IEs Message Type SAE Bearer ID Cause Trace activation Source ID Target ID Source enb to Target enb Transparent Container Target enb to Source enb Transparent Container Source RNC to Target RNC Transparent Container Target RNC to Source RNC Transparent Container Source BSS to Target BSS Transparent Container Target BSS to Source BSS Transparent Container Handover Type Extended RNC-ID SAE Bearer Level QoS Parameters Paging DRX Paging Cause SAE Bearer Type SAE Bearer Bit Rate Aggregate Maximum Bit Rate Criticality Diagnostics Handover Restriction List CDMA2000-PDU CDMA2000 RAT Type CDMA2000 Sector ID Security Information UE Radio Capability Transport Network Layer Related IEs Transport Layer Address GTP-TEID NAS Related IEs LAI RAC MME UE S1AP ID enb UE S1AP ID NAS-PDU S-TMSI TAI PLMN Identity GUMMEI UE Identity Index value IMSI MMEC UE Paging Identity DL Forwarding Direct Forwarding Path Availability Message and Information Element Abstract Syntax (with ASN.1) General Usage of private message mechanism for non-standard use Elementary Procedure Definitions. 84

7 7 TS V8.1.0 ( ) PDU Definitions Information Element Definitions Common Definitions Constant Definitions Container Definitions Message Transfer Syntax Timers Handling of Unknown, Unforeseen and Erroneous Protocol Data General Transfer Syntax Error Abstract Syntax Error General Criticality Information Presence Information Not comprehended IE/IE group Procedure Code A Type of Message IEs other than the Procedure Code and Type of Message Missing IE or IE group IEs or IE groups received in wrong order or with too many occurrences or erroneously present Logical Error Exceptions Handling of AP ID Annex A (informative): Change history 150

8 8 TS V8.1.0 ( ) Foreword This Technical Specification has been produced by the 3 rd Generation Partnership Project (). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document.

9 9 TS V8.1.0 ( ) 1 Scope The present document specifies the E-UTRAN radio network layer signalling protocol for the S1 interface. The S1 Application Protocol (S1AP) supports the functions of S1 interface by signalling procedures defined in this document. S1AP is developed in accordance to the general principles stated in [2] and [3]. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. In the case of a reference to a document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] TR : "Vocabulary for Specifications". [2] TS : E-UTRAN Architecture Description. [3] TS : S1 General Aspects and Principles. [4] ITU-T Recommendation X.691 (07/2002): "Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)". [5] ITU-T Recommendation X.680 (07/2002): "Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation". [6] ITU-T Recommendation X.681 (07/2002): "Information technology - Abstract Syntax Notation One (ASN.1): Information object specification". [7] TS : "Trace concepts and requirements". 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR [1]. Elementary Procedure: S1AP consists of Elementary Procedures (EPs). An Elementary Procedure is a unit of interaction between enbs and the EPC. These Elementary Procedures are defined separately and are intended to be used to build up complete sequences in a flexible manner. If the independence between some EPs is restricted, it is described under the relevant EP description. Unless otherwise stated by the restrictions, the EPs may be invoked independently of each other as stand alone procedures, which can be active in parallel. Examples on using several S1AP EPs together with each other and EPs from other interfaces can be found in reference [FFS]. An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used: - Class 1: Elementary Procedures with response (success and/or failure). - Class 2: Elementary Procedures without response. For Class 1 EPs, the types of responses can be as follows:

10 10 TS V8.1.0 ( ) Successful: - A signalling message explicitly indicates that the elementary procedure successfully completed with the receipt of the response. Unsuccessful: - A signalling message explicitly indicates that the EP failed. - On time supervision expiry (i.e. absence of expected response). Successful and Unsuccessful: - One signalling message reports both successful and unsuccessful outcome for the different included requests. The response message used is the one defined for successful outcome. Class 2 EPs are considered always successful. enb UE S1AP ID: according to definition in [Note (to be removed once captured in another TS): The enb UE S1AP ID shall be allocated so as to uniquely identify the UE over the S1 interface within the enb. When MME receives enb UE S1AP ID it shall store it for the duration of the UE-associated logical S1-connection for this UE. Once known to MME his IE is included in all UE associated S1-AP signalling (UL as well as DL).] MME UE S1AP ID: according to definition in [Note (to be removed once captured in another TS): The MME UE S1AP ID shall be allocated so as to uniquely identify the UE over the S1 interface within the MME. When enb receives MME UE S1AP ID it shall store it for the duration of the UE-associated logical S1-connection for this UE. Once known to enb this IE is included in all UE associated S1-AP signalling (UL as well as DL).] SAE bearer: one or more Service Data Flows between a UE and EPC [according to definition for EPS bearer ]. Note: The SAE bearer is either a default SAE bearer or a dedicated SAE bearer. SAE bearer identity: the SAE bearer identity uniquely identifies an SAE bearer for one UE [according to definition for EPS bearer identity in ]. Note: The SAE bearer identity remains unique for the UE even if the UE-associated logical S1-connection is released during periods of user inactivity. SAE Radio Bearer: the SAE Radio bearer transports the packets of an SAE bearer between a UE and an enb. There is an one-to-one mapping between the SAE bearer and the SAE Radio Bearer. UE-associated signalling: When S1-AP messages associated to one UE uses the UE-associated logical S1-connection for association of the message to the UE in enb and EPC. UE-associated logical S1-connection: The UE-associated logical S1-connection uses the identities MME UE S1AP ID and enb UE S1AP ID according to definition in [23.401]. For a received UE associated S1-AP message the MME identifies the associated UE based on the MME UE S1AP ID IE and the enb identifies the associated UE based on the enb UE S1AP ID IE. The UE-associated logical S1-connection may exist before the S1 UE context is setup in enb. 3.2 Symbols For the purposes of the present document, the following symbols apply: <symbol> <Explanation>

11 11 TS V8.1.0 ( ) 3.3 Abbreviations For the purposes of the present document, the abbreviations given in TR [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR [1]. <ACRONYM> <Explanation> 4 General Editor s Note: Section captures procedure specification principles, forward/backward compatibility issue and specification notations. 4.1 Procedure Specification Principles The principle for specifying the procedure logic is to specify the functional behaviour of the enb exactly and completely. The EPC functional behaviour is left unspecified. The EPs Handover Preparation and others (tbd) are exceptions from this principle. The following specification principles have been applied for the procedure text in clause 8: - The procedure text discriminates between: 1) Functionality which "shall" be executed The procedure text indicates that the receiving node "shall" perform a certain function Y under a certain condition. If the receiving node supports procedure X but cannot perform functionality Y requested in the REQUEST message of a Class 1 EP, the receiving node shall respond with the message used to report unsuccessful outcome for this procedure, containing an appropriate cause value. 2) Functionality which "shall, if supported" be executed The procedure text indicates that the receiving node "shall, if supported," perform a certain function Y under a certain condition. If the receiving node supports procedure X, but does not support functionality Y, the receiving node shall proceed with the execution of the EP, possibly informing the requesting node about the not supported functionality. - Any required inclusion of an optional IE in a response message is explicitly indicated in the procedure text. If the procedure text does not explicitly indicate that an optional IE shall be included in a response message, the optional IE shall not be included. For requirements on including Criticality Diagnostics IE, see section 10. For examples on how to use the Criticality Diagnostics IE, see Annex A Forwards and Backwards Compatibility The forwards and backwards compatibility of the protocol is assured by mechanism where all current and future messages, and IEs or groups of related IEs, include ID and criticality fields that are coded in a standard format that will not be changed in the future. These parts can always be decoded regardless of the standard version. 4.3 Specification Notations For the purposes of the present document, the following notations apply: Procedure Message When referring to an elementary procedure in the specification the Procedure Name is written with the first letters in each word in upper case characters followed by the word "procedure", e.g. SAE procedure. When referring to a message in the specification the MESSAGE NAME is written with all letters in upper case characters followed by the word "message", e.g. MESSAGE NAME message.

12 12 TS V8.1.0 ( ) IE Value of an IE When referring to an information element (IE) in the specification the Information Element Name is written with the first letters in each word in upper case characters and all letters in Italic font followed by the abbreviation "IE", e.g. Information Element IE. When referring to the value of an information element (IE) in the specification the "Value" is written as it is specified in subclause 9.2 enclosed by quotation marks, e.g. "Value".

13 13 TS V8.1.0 ( ) 5 S1AP Services S1AP provides the signalling service between E-UTRAN and the evolved packet core (EPC) that is required to fulfil the S1AP functions described in clause 7. S1AP services are divided into two groups: 1. Non UE-associated services: They are related to the whole S1 interface instance between the enb and MME utilising a non UE-associated signalling connection. 2. UE-associated services: They are related to one UE. S1AP functions that provide these services are associated with a UE-associated signalling connection that is maintained for the UE in question.

14 14 TS V8.1.0 ( ) 6 Services Expected from Signalling Transport The signalling connection shall provide in sequence delivery of S1AP messages. S1AP shall be notified if the signalling connection breaks.

15 15 TS V8.1.0 ( ) 7 Functions of S1AP Editor s Note: Description of S1AP functions. S1AP protocol has the following functions: - SAE Bearer management function: This overall functionality is responsible for setting up, modifying and releasing SAE bearers, which are triggered by the MME The release of SAE bearers may be triggered by the enb as well. - Initial Context Transfer function: This functionality is used to establish an S1UE context in the enb, to setup the default IP connectivity, to setup one or more SAE bearer(s) if requested by the MME, and to transfer NAS signalling related information to the enb if needed. - UE Capability Info Indication function: This functionality is used to provide the UE Capability Info when received from the UE to the MME. - Mobility Functions for UEs in LTE_ACTIVE in order to enable - a change of enbs within SAE/LTE (Inter MME/Serving SAE-GW Handovers) via the S1 interface (with EPC involvement). - a change of RAN nodes between different RATs (Inter--RAT Handovers) via the S1 interface (with EPC involvement). - Paging: This functionality provides the EPC the capability to page the UE. - S1 interface management functions comprise the: - Reset functionality to ensure a well defined initialisation on the S1 interface. - Error Indication functionality to allow a proper error reporting/handling in cases where no failure messages are defined. - Overload function to indicate the load situation in the control plane of the S1 interface. - NAS Signalling transport function between the UE and the MME is used: - to transfer NAS signalling related information and to establish the S1 UE context in the enb. - to transfer NAS signalling related information when the S1 UE context in the enb is already established. - S1 UE context Release function: This functionality is responsible to manage the release of UE specific context in the enb and the MME. - Status Transfer: This functionality transfers PDCP SN Status information from source enb to target enb in support of in-sequence delivery and duplication avoidance for intra LTE handover.

16 16 TS V8.1.0 ( ) 8 S1AP Procedures 8.1 List of S1AP Elementary procedures In the following tables, all EPs are divided into Class 1 and Class 2 EPs (see subclause 3.1 for explanation of the different classes): Elementary Procedure Handover Preparation Handover Resource Allocation Path Switch Request Initiating Message HANDOVER REQUIRED HANDOVER REQUEST PATH SWITCH REQUEST Table 1: Class 1 procedures Successful Outcome Response message HANDOVER COMMAND HANDOVER REQUEST ACKNOWLEDGE PATH SWITCH REQUEST ACKNOWLEDGE HANDOVER CANCEL ACKNOWLEDGE SAE BEARER SETUP RESPONSE SAE BEARER MODIFY RESPONSE SAE BEARER RELEASE COMPLETE INITIAL CONTEXT Unsuccessful Outcome Response message HANDOVER PREPARATION FAILURE HANDOVER FAILURE PATH SWITCH REQUEST FAILURE Handover HANDOVER CANCEL Cancellation SAE Bearer SAE BEARER SETUP Setup REQUEST SAE Bearer SAE BEARER Modify MODIFY REQUEST SAE Bearer SAE BEARER Release RELEASE COMMAND Initial Context INITIAL CONTEXT Setup SETUP REQUEST SETUP RESPONSE Reset RESET RESET ACKNOWLEDGE S1 Setup S1 SETUP REQUEST S1 SETUP RESPONSE S1 SETUP FAILURE UE Context Release UE Context Modification UE CONTEXT RELEASE COMMAND UE CONTEXT MODIFICATION REQUEST UE CONTEXT RELEASE COMPLETE UE CONTEXT MODIFICATION RESPONSE INITIAL CONTEXT SETUP FAILURE UE CONTEXT MODIFICATION FAILURE Table 2: Class 2 procedures Elementary Procedure Handover Notification SAE Bearer Release Request Paging Initial UE Message Downlink NAS Transport Uplink NAS Transport NAS non delivery indication Error Indication UE Context Release Request DownlinkS1 CDMA2000 Tunneling Uplink S1 CDMA2000 Tunneling UE Capability Info Indication enb Status Transfer MME Status Transfer Message HANDOVER NOTIFY SAE BEARER RELEASE REQUEST PAGING INITIAL UE MESSAGE DOWNLINK NAS TRANSPORT UPLINK NAS TRANSPORT NAS NON DELIVERY INDICATION ERROR INDICATION UE CONTEXT RELEASE REQUEST DOWNLINK S1 CDMA2000 TUNNELING UPLINK S1 CDMA2000 TUNNELING UE CAPABILITY INFO INDICATION enb STATUS TRANSFER MME STATUS TRANSFER The following applies concerning interference between Elementary Procedures: - The Reset procedure takes precedence over all other EPs.

17 17 TS V8.1.0 ( ) 8.2 SAE Bearer Management procedures SAE Bearer Setup General The purpose of the SAE Bearer Setup procedure is to assign resources on Uu and S1 for one or several SAE bearers and to setup corresponding SAE Radio Bearers for a given UE. The procedure uses UE-associated signalling Successful Operation enb MME SAE BEARER SETUP REQUEST SAE BEARER SETUP RESPONSE Figure : SAE Bearer Setup procedure. Successful operation. The MME initiates the procedure by sending an SAE BEARER SETUP REQUEST message to the enb. When sending the SAE BEARER SETUP REQUEST message the MME shall start the T SAEBearerSetup timer. - The SAE BEARER SETUP REQUEST message shall contain the information required by the enb to build the SAE bearer configuration consisting of at least one additional SAE bearer including for each SAE bearer to setup in the SAE Bearer to be Setup List IE. Upon reception of the SAE BEARER SETUP REQUEST message, and if resources are available for the requested configuration, the enb shall execute the requested SAE bearer configuration. For each SAE bearer and based on the SAE Bearer level QoS parameters IE the enb shall establish an SAE Radio Bearer and allocate the required resources on Uu. The enb shall pass the NAS-PDU IE and the value contained in the SAE bearer identity IE received for the SAE bearer for each established SAE Radio Bearer to the UE. The enb shall allocate the required resources on S1 for the SAE bearers requested to be established. If the Trace activation IE is included in the SAE BEARER SETUP REQUEST message then enb should initiate the requested trace function as described in The enb shall report to the MME, in the SAE BEARER SETUP RESPONSE message, the result for all the requested SAE bearers. A list of SAE bearers which are successfully established shall be included in the SAE Bearer Setup List IE. A list of SAE bearers which failed to be established shall be included in the SAE Bearer Failed to Setup List IE. In case of the establishment of an SAE bearer the EPC must be prepared to receive user data before the SAE BEARER SETUP RESPONSE message has been received. Upon reception of the SAE BEARER SETUP RESPONSE message the MME shall stop timer T SAEBearerSetup. Interactions with Handover Preparation procedure: If a handover becomes necessary during SAE bearer setup, the enb may interrupt the ongoing SAE bearer Setup procedure and initiate the Handover Preparation procedure as follows:

18 18 TS V8.1.0 ( ) 1. The enb shall terminate the SAE bearer Setup procedure and shall send the SAE BEARER SETUP RESPONSE message in which the enb shall indicate, if necessary - the SAE bearer(s) failed to setup in the SAE Bearer Failed to Setup List IE with the cause "handover triggered" and - the SAE bearer(s) successfully setup in the SAE Bearer to be Setup List IE. 2. The enb shall trigger the handover procedure by sending a HANDOVER REQUIRED message to the EPC. 3. The EPC shall terminate the SAE bearer Setup procedure at reception of the SAE BEARER SETUP RESPONSE message Unsuccessful Operation The unsuccessful operation is specified in the successful operation section Abnormal Conditions Editor s Note: Further Assessment required SAE Bearer Modify General The purpose of the SAE Bearer Modify procedure is to enable modifications of already established SAE bearers for a given UE. The procedure uses UE-associated signalling Successful Operation enb MME SAE BEARER MODIFY REQUEST SAE BEARER MODIFY RESPONSE Figure : SAE Bearer Modify procedure. Successful operation. The MME initiates the procedure by sending an SAE BEARER MODIFY REQUEST message to the enb. When sending the SAE BEARER MODIFY REQUEST message the MME shall start the T SAEBearerModify timer. The SAE BEARER MODIFY REQUEST message shall contain the information required by the enb to modify one or several SAE bearers of the existing SAE Bearer configuration. Information shall be present in the SAE BEARER MODIFY REQUEST message only when any previously set value for the SAE bearer configuration is requested to be modified. Upon reception of the SAE BEARER MODIFY REQUEST message, and if resources are available for the requested target configuration, the enb shall execute the modification of the requested SAE bearer configuration. For each SAE bearer that shall be modified and based on the new SAE Bearer level QoS parameters IE the enb shall modify the SAE Radio Bearer configuration and change allocation of resources on Uu according to the new resource request. The enb shall pass the NAS-PDU IE and the value contained in the SAE bearer identity IE received for the SAE bearer to the UE when modifying the SAE Radio Bearer configuration. enb shall change allocation of resources on S1 according to the new resource request.

19 19 TS V8.1.0 ( ) If the E-UTRAN failed to modify an SAE Bearer the E-UTRAN shall keep the SAE Bearer configuration as it was configured prior the SAE BEARER MODIFY REQUEST. The enb shall report to the MME, in the SAE BEARER MODIFY RESPONSE message, the result for all the requested SAE bearers to be modified. A list of SAE bearers which are successfully modified shall be included in the SAE Bearer Modify List IE. A list of SAE Bearers which failed to be modified shall be included in the SAE Bearer Failed to Modify List IE. In case of a modification of an SAE Bearer the EPC must be prepared to receive user data according to the modified SAE bearer profile prior to the SAE BEARER MODIFY RESPONSE message. Upon reception of the SAE BEARER MODIFY RESPONSE the MME shall stop T SAEBearerModify. Interactions with Handover Preparation procedure: If a handover becomes necessary during SAE bearer modify, the enb may interrupt the ongoing SAE bearer Modify procedure and initiate the Handover Preparation procedure as follows: 1. The enb shall terminate the SAE bearer Modify procedure and shall send the SAE BEARER MODIFY RESPONSE message in which the enb shall indicate, if necessary - the SAE bearer(s) failed to modify in the SAE Bearer Failed to Modify List IE with the cause "handover triggered" and - the SAE bearer(s) successfully modified in the SAE Bearer Modify List IE. 2. The enb shall trigger the handover procedure by sending a HANDOVER REQUIRED message to the EPC. 3. The EPC shall terminate the SAE bearer modify procedure at reception of the SAE BEARER MODIFY RESPONSE message Unsuccessful Operation The unsuccessful operation is specified in the successful operation section Abnormal Conditions Editor s Note: Further Assessment required SAE Bearer Release General The purpose of the SAE Bearer Release procedure is to enable the release of already established SAE Bearers for a given UE. The procedure uses UE-associated signalling.

20 20 TS V8.1.0 ( ) Successful Operation SAE Bearer Release - MME initiated enb MME SAE BEARER RELEASE COMMAND SAE BEARER RELEASE COMPLETE Figure : SAE Bearer Releae procedure. Successful operation. The MME initiates the procedure by sending an SAE BEARER RELEASE COMMAND message. When sending the SAE BEARER RELEASE COMMAND message, the MME shall start the T SAEBEAERERRELEASE timer. The SAE BEARER RELEASE COMMAND message shall contain the information required by the enb to release at least one SAE bearer in the SAE Bearer To Be Released List IE. Upon reception of the SAE BEARER RELEASE COMMAND message the enb shall execute the release of the requested SAE Bearers. For each SAE bearer to be released the enb shall release the corresponding SAE Radio Bearer and release the allocated resources on Uu. The enb shall pass the value contained in the SAE bearer identity IE received for the SAE bearer to the radio interface protocol for each SAE Radio Bearer to be released. enb shall release allocate resources on S1 for the SAE bearers requested to be released. The enb shall report to the MME, in the SAE BEARER RELEASE COMPLETE message, the result for all the SAE bearers to be released. A list of SAE bearers which are released successfully shall be included in the SAE Bearer Release List IE. A list of SAE bearers which failed to be released shall be included in the SAE Bearer Failed to Release List IE., The enb shall be prepared to receive an SAE BEARER RELEASE COMMAND message on an established UEassociated logical S1-connection containing an SAE Bearer Release List IE at any time and shall always reply to it with an SAE BEARER RELEASE COMPLETE message. After sending an SAE BEARER RELEASE COMPLETE message containing an SAE Bearer identity within the SAE Bearer Release List IE, the enb shall be prepared to receive an SAE BEARER SETUP REQUEST message requesting establishment of an SAE bearer with this SAE bearer identity. If a handover becomes necessary during SAE bearer release, the enb may interrupt the ongoing SAE bearer Release procedure and initiate the Handover Preparation procedure as follows: 1. The enb shall terminate the SAE bearer Release procedure and shall send the SAE BEARER RELEASE COMPLETE message in which the enb shall indicate, if necessary - the SAE bearer(s) failed to release in the SAE Bearer Failed to Release List IE with the cause "handover triggered" and - the SAE bearer(s) successfully released in SAE Bearer Release List IE. 2. The enb shall trigger the handover procedure by sending a HANDOVER REQUIRED message to the EPC. 3. The EPC shall terminate the SAE bearer Release procedure at reception of the SAE BEARER RELEASE COMPLETE message.

21 21 TS V8.1.0 ( ) SAE Bearer Release Request - enb initiated enb MME SAE BEARER RELEASE REQUEST Figure : SAE Bearer Release Request procedure. Successful operation. The enb initiates the procedure by sending an SAE BEARER RELEASE REQUEST message towards the MME. The SAE BEARER RELEASE REQUEST message shall contain at least one SAE bearers requested to be released, in the SAE Bearer To Be Released List IE. Upon reception of the SAE BEARER RELEASE REQUEST message the MME should normally initiate the appropriate release procedure for the SAE bearers identified in the SAE BEARER RELEASE REQUEST message as defined in the Interaction with SAE Bearer Release paragraph below. It is up to the MME to decide how to react to the request. Interaction with UE Context Release procedure: If no SAE bearers will remain according to the SAE bearer RELEASE REQUEST message, the MME may initiate the UE Context Release Command procedure if it does not want to keep the UE-associated logical S1-connection. Editor s Note: whether this is allowed at all (default bearer handling) needs to be checked, see open issue list. Interaction with SAE bearer Release procedure (MME initiated): If the EPC decides to release some or all indicated SAE bearers, the MME shall invoke the SAE BEARER RELEASE COMMAND procedure (release SAE bearer) to this effect Abnormal Conditions Editor s Note: Further Assessment required. 8.3 Context Management procedures Initial Context Setup General The purpose of the Initial Context Setup procedure is to establish the necessary overall initial UE Context including SAE Bearer context, Security context, Handover Restriction List, UE capability information, NAS-PDU etc. The procedure uses UE-associated signalling.

22 22 TS V8.1.0 ( ) Successful Operation enb MME INITIAL CONTEXT SETUP REQUEST INITIAL CONTEXT SETUP RESPONSE Figure : Initial Context Setup procedure. Successful operation. In case of the establishment of an SAE Bearer the MME must be prepared to receive user data before the INITIAL CONTEXT SETUP RESPONSE message has been received. When sending the INITIAL CONTEXT SETUP REQUEST message, the MME shall start the T InitialContextSetup timer. The INITIAL CONTEXT SETUP REQUEST message shall contain within the SAE Bearer to be Setup List IE the information required by the enb to build the new SAE Bearer configuration consisting of at least one additional SAE Bearer. The SAE Bearer to be Setup List IE may contain: - the SAE Bearer level QoS parameters IE The INITIAL CONTEXT SETUP REQUEST message may contain - the Aggregate Maximum Bit Rate IE (Usage for several APNs FFS) - the Serving PLMN IE, and shall contain this Information Element if MME serves more than one PLMN identity. - the Handover Restriction List IE, which may contain roaming, area or access restrictions - the NAS-PDU IE (FFS) - Security (FFS) - the UE Radio Capability IE. Upon receipt of the INITIAL CONTEXT SETUP REQUEST the enb shall - attempt to execute the requested SAE Bearer configuration. - pass the value contained in the SAE Bearer ID IE to the radio interface protocol for each SAE Bearer requested to be established. - not interpret or modify the information contained in the NAS-PDU IE. The content of the NAS-PDU is outside the scope of this specification. - store the Serving PLMN in the UE context. - store the Handover restriction List in the UE context. - store the received UE Radio Capabilities in the UE context. The enb should use the information in Handover Restriction List IE to determine a target cell for handover. If the Handover Restriction List IE is not contained in the INITIAL CONTEXT SETUP REQUEST message, the target enb shall consider that no access restriction applies to the UE. If the Trace activation IE is included in the INITIAL CONTEXT SETUP REQUEST message then enb should initiate the requested trace function as described in

23 23 TS V8.1.0 ( ) The enb shall report to the MME, in the INITIAL CONTEXT SETUP RESPONSE message, the successful establishment of the security procedures with the UE, and, the result for all the requested SAE Bearers in the following way: A list of SAE Bearers which are successfully established shall be included in the SAE Bearer Setup List IE A list of SAE Bearers which failed to be established shall be included in the SAE Bearer Failed to Setup List IE. After sending the INITIAL CONTEXT SETUP RESPONSE message, the procedure is terminated in the enb. Upon reception of the INITIAL CONTEXT SETUP RESPONSE message the MME shall stop timer T InitialContextSetup Unsuccessful Operation enb MME INITIAL CONTEXT SETUP REQUEST INITIAL CONTEXT SETUP FAILURE Figure : Initial Context Setup procedure. Unsuccessful operation Abnormal Conditions Editor s Note: Further Assessment required UE Context Release Request - enb initiated General The purpose of the UE Context Release Request procedure is to enable the enb to request the MME to release the UEassociated logical S1-connection due to EUTRAN generated reason (e.g. TX2 RELOCOverall Expiry ). The procedure uses UE-associated signalling Successful Operation enb MME UE CONTEXT RELEASE REQUEST Figure : UE Context Release Request procedure. Successful operation.

24 24 TS V8.1.0 ( ) The enb controlling a UE-associated logical S1-connection initiates the procedure by generating an UE CONTEXT RELEASE REQUEST message towards the affected MME node. The UE CONTEXT RELEASE REQUEST message shall indicate the appropriate cause value for the requested UEassociated logical S1-connection release UE Context Release (MME initiated) General The purpose of the UE Context Release procedure is to enable to MME to order the release of the UE-associated logical connection due to various reasons, for example completion of a transaction between the UE and the EPC or completion of successful handover. The MME initiated UE Context Release procedure may be initiated in response to the enb initiated UE Context Release Request procedure. The procedure uses UE-associated signalling. Editor s Note:The usage of this procedure to handle detection of two UE-associated logical connections towards one UE is FFS Successful Operation enb MME UE CONTEXT RELEASE COMMAND UE CONTEXT RELEASE COMPLETE Figure : UE Context Release procedure. Successful operation. Upon reception of the UE CONTEXT RELEASE COMMAND message, the enb shall release all related signalling and user data transport resources and reply with the UE CONTEXT RELEASE COMPLETE message UE Context Modification General The purpose of the UE Context Modification procedure is to modify the established UE Context partly (e.g. with security information). The procedure uses UE-associated signalling.

25 25 TS V8.1.0 ( ) Successful Operation enb MME UE CONTEXT MODIFICATION REQUEST UE CONTEXT MODIFICATION RESPONSE Figure : UE Context Modification procedure. Successful operation. The UE CONTEXT MODIFICATION REQUEST message may contain - the security information IE (includes the AS security key) Upon receipt of the UE CONTEXT MODIFICATION REQUEST the enb shall - store the received security information IE and take it into use. The enb shall report, in the UE CONTEXT MODIFICATION RESPONSE message to the MME, the successful update of the UE context: After sending the UE CONTEXT MODIFICATION RESPONSE message, the procedure is terminated in the enb Unsuccessful Operation enb MME UE CONTEXT MODIFICATION REQUEST UE CONTEXT MODIFICATION FAILURE Figure : UE Context Modification procedure. Unsuccessful operation. In case the UE context update cannot be performed successfully the enb shall respond with the UE CONTEXT MODIFICATION FAILURE message to the MME with an appropriate cause value in the Cause IE. 8.4 Handover Signalling Handover Preparation General The purpose of the Handover Preparation procedure is to request the preparation of resources at the target side via the EPC. Editor s Note: It is FFS whether the enodeb is allowed to initiate this procedure in case there is an already prepared handover for this particular UE either on S1or on any of its X2 interfaces.

26 26 TS V8.1.0 ( ) Successful Operation source enodeb MME HANDOVER REQUIRED HANDOVER COMMAND Figure : Handover preparation: successful operation The source enodeb initiates the handover preparation by sending the HANDOVER REQUIRED message to the serving MME. Editor s note: How to handle and control data forwarding is FFS. When the preparation, including the reservation of resources at the target side is ready, the MME responds with the HANDOVER COMMAND message to the source enodeb. If the Target enodeb to Source enodeb Transparent Container IE or the Target RNC To Source RNC Transparent Container IE or the Target BSS to Source BSS Transparent Container IE has been received by the MME from the handover target then the transparent container shall be included in the HANDOVER COMMAND message. If there are any SAE bearers that could not be admitted in the target, they shall be indicated in the SAE Bearers to Release List IE. If the DL forwarding IE is included within the Source enodeb to Target enodeb Transparent Container IE of the HANDOVER REQUIRED message and it is set to DL forwarding proposed, it indicates that the source enodeb proposes forwarding of downlink data. For each bearer for which the source enodeb proposes to do forwarding of downlink data, the source enodeb may include the Direct Forwarding Path Availability IE in the HANDOVER REQUIRED message. If HANDOVER REQUIRED message does not contain the Direct Forwarding Path Availability IE then indirect forwarding may be applied, if available. Interactions with SAE Bearer Management procedures: If, after a HANDOVER REQUIRED message is sent and before the Handover Preparation procedure is terminated, the source enb receives a MME initiated SAE Bearer Management procedure on the same UE associated signaling connection, the source enb shall either: 1. cancel the Handover Preparation procedure by executing the Handover Cancel procedure with an appropriate cause value "Interaction with other procedure. After successful completion of the Handover Cancel procedure, the source enb shall continue the MME initiated SAE Bearer Management procedure or 2. terminate the MME initiated SAE Bearer Management procedure by sending the appropriate response message with the cause value Handover Triggered to the MME and then the source enb shall continue with the handover procedure Unsuccessful Operation

27 27 TS V8.1.0 ( ) source enodeb MME HANDOVER REQUIRED HANDOVER PREPARATION FAILURE Figure : Handover preparation: unsuccessful operation If the EPC or the target system is not able to accept any of the bearers or a failure occurs during the Handover Preparation, the MME sends the HANDOVER PREPARATION FAILURE message with an appropriate cause value to the source enodeb Abnormal Conditions Handover Resource Allocation General The purpose of the Handover Resource Allocation procedure is to reserve resources at the target enodeb for the handover of a UE Successful Operation target enodeb MME HANDOVER REQUEST HANDOVER REQUEST ACKNOWLEDGE Figure : Handover resource allocation: successful operation The MME initiates the procedure by sending the HANDOVER REQUEST message to the target enodeb. If the Source enodeb to Target enodeb Transparent Container IE or the Source RNC to Target RNC Transparent Container IE or the Source BSS to Target BSS Transparent Container IE has been received by the MME from the source side the MME includes the transparent container in the HANDOVER REQUEST message. The HANDOVER REQUEST message may contain the Serving PLMN IE, and shall contain this Information Element if MME serves more than one PLMN identity. The HANDOVER REQUEST message may contain the Handover Restriction List IE, which may contain roaming area or access restrictions. If the Serving PLMN IE or the Handover Restriction List IE is contained in the HANDOVER REQUEST message, the target enb shall store this information in the UE context. The enb should use the information in Handover Restriction List IE to determine a target cell for handover. If the Handover Restriction List IE is not contained in the HANDOVER REQUEST message, the target enb shall consider that no access restriction applies to the UE.

28 28 TS V8.1.0 ( ) After all necessary resources for the admitted SAE Bearers have been allocated the target enodeb generates the HANDOVER REQUEST ACKNOWLEDGE message. The target enodeb shall include in the SAE Bearers Admitted List IE the SAE Bearers for which resources have been prepared at the target cell. The SAE bearers that have not been admitted in the target cell shall be included in the SAE Bearers Failed to Setup List IE. For each bearer that target enb has decided to admit and for which DL forwarding IE is set to DL forwarding proposed, the target enb may include the DL GTP Tunnel endpoint IE within the SAE Bearers Admitted List IEs IE of the HANDOVER REQUEST ACKNOWLEDGE message indicating that it accepts the proposed forwarding of downlink data for this bearer Unsuccessful Operation target enodeb MME HANDOVER REQUEST HANDOVER FAILURE Figure : Handover resource allocation: unsuccessful operation If the target enodeb is not able to admit any of the SAE Bearers or a failure occurs during the Handover Preparation, it shall send the HANDOVER REQUEST FAILURE message to the MME with an appropriate cause value Abnormal Conditions Handover Notification General The purpose of the Handover Notification procedure is to indicate to the MME that the UE has arrived to the target cell and the S1 handover has been successfully completed Successful Operation target enodeb MME HANDOVER NOTIFY Figure : Handover notification The target enodeb shall send the HANDOVER NOTIFY message to the MME when the UE has been identified in the target cell and the S1 handover has been successfully completed.

29 29 TS V8.1.0 ( ) Abnormal Conditions Path Switch Request General The purpose of the Path Switch Request procedure is to request the switch of a downlink GTP tunnel towards a new GTP tunnel endpoint Successful Operation enodeb MME PATH SWITCH REQUEST PATH SWITCH REQUEST ACKNOWLEDGE Figure : Path switch request: successful operation The enodeb initiates the procedure by sending the PATH SWITCH REQUEST message to the MME. After all necessary updates including the UP path switch have been successfully completed in the EPC, the MME shall send the PATH SWITCH REQUEST ACKNOWLEDGE message to the enodeb and the procedure ends. Editor s Note: The procedure text above (and for the failure cases) needs to cover the case where no, all, or some bearers are successfully switched, i.e. when to use the ACK and when to use the FAILURE response messages. Editor s Note: It is FFS if EPC should have possibilities to change UL TEID with this procedure Unsuccessful Operation enodeb MME PATH SWITCH REQUEST PATH SWITCH REQUEST FAILURE Figure : Path switch request: unsuccessful operation If a failure occurs in the EPC during the execution of the Path Switch Request procedure, the MME shall send the PATH SWITCH REQUEST FAILURE message to the enodeb with an appropriate cause value.

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